Omega-phenyl-omega-pyridyl alkylamine derivatives



United States Patent 01 iice 3,426,034 Patented] Feb. 4, 1969 wherein each of Alk and Alk are alkylene of 2 to 4 carbon atoms, the total carbon atoms of Alk and Alk being at least 6, and each of R and R are selected from the group consisting of hydrogen, chlorine, hydroxy, lower alkoxy and lower alkyl which are active as coronary vasodilators and have positive inotropic activity.

This is a continuation-in-part of application Ser. No. 328,119, filed Dec. 4, 1963, now abanoned.

The present invention relates to novel w-phenyl-w pyridyl alkylamine derivatives of the following formula:

in which each of AIR and Alk are straight or branch chained alkylene of 2 to 4 carbon atoms, the total carbon atoms of All; and All: being at least 6, and each of R and R are hydrogen, chlorine, hydroxy, lower alkoxy, such as methoxy, or lower alkyl, such as methyl, and their acid addition salts with acids having pharmaceutically acceptable anions. The novel compounds according to the invention simultaneously have a good activity as coronary vasodilators and a good positive inotropic activity (increase in amplitude of heart contractions).

The novel compounds according to the invention can be prepared by a number of conventional reactions used in the synthesis of organic compounds as can be seen from the following illustrative examples.

2 Example 1 N-3-[phenyl-propyl-(2)]-4 phenyl 4 pyridyl-(2)- butyl-( 1)-amine I Hm 33.8 g. of Z-benzylpyridine were dissolved in 50 cc. of benzene and 15.6 g. of a 50% NaNH benzene suspension added thereto and the mixture refluxed for 2 hours. Then 63 g. of N-(3-bromo-propyl)-3-phenyl-propyl-(2)- amine in cc. of benzene were added dropwise. The mixture was boiled under reflux for 4 hours. After completion of the reaction the reaction mixture was cooled and water added thereto. The benzene layer was separated ofi and the aqueous layer extracted again with benzene. The combined benzene solutions were concentrated and the residue fractionated. The free base distilled over at 215-217 C. at 0.8 torr (1 torr=the pressure of a column of Hg 1 mm. high). The base when reacted with 1 mol of maleic acid produced a crystalline salt which after recrystallization from isopropanol had a melting point of 127l28 C.

Example 2 N-[Zl-p-Cl-phenyl 2 methyl-propyl-(Z)]-3-phenyl- 3-[Pyr1dy1-(2) ]-propyl-( 1 )-amine 33.8 g. of Z-benzylpyridine were first treated with NaNH as described in Example 1 and then reacted with 73 g. of 3-(p-Cl-phenyl)-2-methyl-2-(w-Br-ethylamino)- propane and the reaction mixture processed as in Example 1. The base produced boiled at 210-223 C. at 0.3 torr. The maleic acid salt thereof, prepared and recrystallized as in Example 1, had a melting point of 137138 C Example 3 Cilia-( 1H was prepared by a process analogous to that described in Example 1. The free base boiled at 210212 C. at 0.4 torr. A crystalline salt was prepared with /2 mol of fumaric acid which after recrystallization from isopropanol had a melting point of l57-158 C.

3 Example 4 N [3 (p chlorophenyl)-2-methyl-propyl-(2)]-{4- phenyl-4-[pyridyl-(2) ]-butyl-(1)}-amine Example 5 N [4 phenyl butyl (2)]-4-phenyl-4-pyridyl-(2)- butyl-( 1)-amine was prepared as described in Example 1 from 33.6 g. of benzylpyridine, 7.8 g. NaNH and 35.1 g. of N-[3-bromopropyl-(1)J-[4-phenyl-butyl-(2)]-amine. Its boiling point was 207212 C. at 0.1 torr. The crystalline maleic acid salt thereof produced with 1 mol maleic acid after recrystallization from isopropanol had a melting point of 129130 C.

Example 6 N [3 p chlorophenyl 2 methylpropyl (2)] 3- phenyl-3- [pyridyl- (2) ]-propyl-( 1 )-amine 4 40 g. (0.19 mol) of fl-phenyl-fl-pyridyl-(2)-propionaldehyde together with 35 g. (0.19 mol) of l-p-chlorophenyl-2-methyl-2-amino-propane in 500 cc. of absolute alcohol were refluxed for 1 hour. After cooling the Schiff base produced was reduced with 5 g. of sodium borohydride dissolved in 50 cc. of ethanol. Thereafter water was added to the reaction mixture and the alcohol and water distilled off. The residue was taken up in ether and dried with potash and the ether distilled off. The residue was fractionated. Tht base distilled over at 175190 C. at 0.05 torr. The crystalline salt obtained with 1 mol of maleic acid after recrystallization from isopropanol had a melting point of 137-138 C.

Example 7 22.6 g. of -phenyl-y-pyridyl-(2)-butyraldehyde and 17.0 g. of l-(p-chlorophenyl)-propyl-(2)-amine were refluxed on a water bath for one hour in 200 ml. of ethanol. After cooling the Schiff base produced was reduced with 2 g. of sodium borohydride dissolved in 50 cc. of ethanol. Thereafter water was added to the reaction mixture and the alcohol and water distilled off. The residue was taken up in ether and dried with potash and the ether distilled off. The residue was fractionated. The base distilled over at 170200 C. at 0.05 torr. The crystalline salt obtained with 1 mol. of maleic acid after recrystallization from ethyl acetate had a melting point of 142 C.

Example 8 N [3 (4-hydroxy-phenyl -propyl- (2) ]-{4-phenyl-4- [pyridyl- (2) -butyl-( l }-amine 37.5 g. of 'y-phenyl-v-pyridyl-(2)-butyraldehyde and 40 g. of p-benzyloxyphenyl-propyl-(2) amine were refluxed on a water bath for one hour in 200 ml. of ethanol. After cooling the Schifi base produced was reduced with 6.5 g. of sodium borohydride dissolved in 50 cc. of ethanol. Thereafter water was added to the reaction mixture to precipitate the base which was then debenzylated, without purification, with hydrogen in the presence of 8 g. of palladium carbon (10%) in 300 ml. of ethanol. The catalyst was then filtered 011?, the solvent distilled oil and the residue dissolved in ether. This solution was neutralized with citric acid. 37 grams of the citrate were obtained which after recrystallization from isopropanol had a melting point of 75 C.

5 We claim: 1. A compound of the formula wherein each of Alk and Alk are alkylene of 2 to 4 carbon atoms, the total carbon atoms of Alk and Alk being at least 6, and each of R and R are selected from the group consisting of hydrogen, chloride, hydroxy, lower alkoxy and lower alkyl.

2. A compound as claimed in claim 1 of the formula I WQ 3. A compound as claimed in claim 1 of the formula om-o-omo1 4. A compound as claimed in claim 1 of the formula 5. A compound as claimed in claim 1 of the formula (l ll References Cited UNITED STATES PAT ENTS 7/1962 Thiele 260-296 OTHER REFERENCES Burger, Medicinal Chemistry, 2nd Ed., Interscience,

0 New York, 1960; p. 78.

HENRY R. JILES, Primary Examiner.

A. L. ROTMAN, Assistant Examiner.

U.S. Cl. X.R. 260-999 

